Curved wood tube and method of making the same



J. GZUMPFT- cunvzn WOOD'TIJBE AND METHOD OF MAKING THE SAME.

Armcmou FILED luv :1. ma.

1,353,895. mm Sept 28,1920.

uNrrEn STATES PATENT OFFICE.

JOHN CZUMPFT, OF BROOKLYN, NEW?" YORK, ASSIGNOR T0 ART WOODWORK OOMPANY,

OF BROOKLYN. NEW YORK, A GOPABJINERSIIIP COMPRISING ROBERT T. BUTTE-L- MAN, JOHN CZUMPF'I, AND JOHN J'lII'NGr.

CURVED WOOD TUBE AND METHOD OF MAKINQ Specification of Letters Patent. I Patented Sept, 1920.

Application filed May 21, 1918. Serial No. 235.838.

To all whom it may concern:

Be it known that 1, JOHN CzUMrFT, a citizen of the United States, residing at Brook- 1 n, in the county of Kings and State of ew York, have invented certain new and useful Improvements in Curved \Vood Tubes and Methods of Making the Same, of which the following is a specification.

This invention relates to the manufacture of wood tubes, the object thereof being to provide a curved wood tube and method of making the same, whereby there is produced in a practical, expeditious and efficient way a curved tube from wood adapted for various purposes, and the interior of which will be smooth and free from obstructions, while the walls of the tube will be of uniform thickness throughout.

In the drawings accompanying and forming a part of this specification, Figure l is aside view of this improved wood tube; Fig. 2 is a view taken at right angles thereto and looking at the ends of the tube; F ig. 3 illustrates the manner of making the tube, it showing two half sections which, when joined together in the manner shown in Fig. 2, form the tube; big. 4 illustrates the man nor of making quarter sections of wood tubing; Fig. 5 is a sectional view of the tube shown in Fig. 2, Fig. 6 is an end view thereof; and Figs. 7 and 8 illustrate the manner of making a larger section of tubing,Fig. 7 being a view similar to Fig. 4 while Fig. 8 is a view similar to Fig. 6.

Similar characters of reference indicate corresponding parts in the several figures of the drawings.

As it is not practically possible to form curved wood tubes of an integral structure upon lathes, I have, after considerable experiment, provided a way of making such curved tubes.

In making the curved wood tubes of any desired diameter, I take a block of wood 2 and in this block of wood I make a semi-circular or half round or grooved complete circle on a lathe of the desired diameter as 3 (see Figs. 3, 4 and 7) and then turn up the outside of the block so as to give the desired shape and thickness of walls. I then take this circular rooved and shaped member and out it either into halves as shown in Fi 3 or into quarters as shown in Figs. 4 an 7 according to the length of curved tube desired, the half sections being illustrated as a and b and the quarter sections as c, d, e and f, and then fit a pair of half sections together as illustrated in Figs. 1 and 2 or a pair of the quarter sections together in the same manner. Thus each block whenmut in half will. form one tube, while when out in quarters it will form two tubes. The opposite outer edges of the sections are however, first provided with a groove 4, into which is fitted a flexible key or spline 5 of wood, and then the two halves or two quarter sections are glued together, thus forming the curved wood tube. By this improved method a curved wood tube may be made of any desired form and shape, that is, of any desired curve equal to or less than a half circle, or by making two blocks in the manner described a complete tubular circle may be obtained.

n some instances, the ends of the tube may be rubbeted so that one section may be joined to another, and in this way any de sired length of curved tubing may be obtained. so that an S-shape or any other form of curved tubing may be provided.

From the foregoing it will be seen that each tube is made up of two half lengthwise curved sections, each of a half round portion, so that any desired length of curve up to a. complete half circle may be made from a single block, and which tubes, as stated, may be joined endwise if it is desired to prolong the length of the tube.

I claim as my invention:

1. A longitudinally curved wood tube of circular cross section, oomprisin a plurality of wooden channel sections 0 semicircular inner and outer profile and of a circular curvature, so as to makeit possible to produce said channel sections on a lathe from a block of wood, said circular channel sections being rabbeted at their juxtaposed front and back faces, and having grooves alongside their 'uxtaposed longitudinal faces, and flex! le longitudinal wood splines in said grooves and glue or other means between them to fasten said channel sections together so as to form a wooden tube of almost any thickness of wall and of almost any desired curvature of line.

2. The method of making wood tubes of varied curvature, which consists in forming circular channels of a circular inner and outer profile from :1 block of Wood, eutting such a Way as to form a Wood tube of the longitudinal grooves in the two circular curvature desired and calculated. 10 faces of said channels, cutting said chan- Signed in the city county and State of nels into suitable sections, rahbeting tlhe New York, this 17th day of May, 1918.

front faces of said channel sections, app yr ing flexible longitudinal splines into the JOHN CUMI grooves of said sections and joining said see In the resence of tions together by glue or by other means in S. ALLQ. 

